KNAW Repository

External nutrient inputs into terrestrial ecosystems of the Falkland Islands and the Maritime Antarctic region

Bokhorst, S.F. and Huiskes, A.H.L. and Convey, P. and Aerts, R.A.M. (2007) External nutrient inputs into terrestrial ecosystems of the Falkland Islands and the Maritime Antarctic region. Polar Biology, 30, 1315-1321. ISSN 0722-4060.

[img]PDF - Published Version
Restricted to KNAW only

275Kb

Official URL: http://dx.doi.org/10.1007/s00300-007-0292-0

Abstract

Antarctic terrestrial ecosystems are nutrient-poor and depend for their functioning in part on external nutrients. However, little is known about the relative importance of various sources. We measured external mineral nutrient sources (wind blown material, precipitation and guano) at three locations, the cold temperate oceanic Falkland Islands (51°76′S), and the Maritime Antarctic Signy (60°71′S) and Anchorage Islands (67°61′S). These islands differ in the level of vegetation development through different environmental constraints and historical factors. Total mineral nitrogen input differed considerably between the islands. During the 3 month summer period it amounted to 18 mg N m−2 on the Falkland Islands and 6 and 102 mg N m−2 at Signy and Anchorage Islands, respectively. The high value for Anchorage was a result of guano deposition. By measuring stable isotopic composition (δ15N) of the different nitrogen sources and the dominant plant species, we investigated the relative utilisation of each source by the vegetation at each island. We conclude that external mineral nitrogen inputs to Antarctic terrestrial ecosystems show great spatial variability, with the local presence of bird (or other vertebrate) colonies being particularly significant.

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:4578
Deposited On:16 Sep 2009 02:00
Last Modified:24 Apr 2012 16:48

Repository Staff Only: item control page